Firing system in a precharged pneumatic (pcp) rifle

ABSTRACT

Invention relates to a firing system using a gas piston (7) instead of trigger spring providing firing by air released after hit of air outlet valve needle (1) in pre-charged pneumatic (PCP) rifles requiring high speed of outlet and allowing achievement of outlet speeds and firing numbers required by use of lever (3) preventing at once release of air in the tube and giving high speed during firing.

TECHNICAL FIELD

Invention relates to a firing system using a gas piston instead oftrigger spring providing firing by air released after hit of air outletvalve needle in pre-charged pneumatic (PCP rifles requiring high speedof outlet and allowing achievement of outlet speeds and firing numbersrequired by use of lever preventing at once release of air in the tubeand giving high speed during firing.

PRIOR ART

In the state of the art, when setting mechanism in pre-charged pneumatic(PCP) rifles, cocking lever drives hammer and provides compression ofspring therein. When trigger is pressed, released hammer hits the airoutlet valve needle with the energy gained by hammer spring and air isreleased from tube and the released air provides firing.

In the known embodiment in the state of art, hammer springs inpre-charged pneumatic (PCP) rifles are helical springs. The springscause occurrence of some problems. The energy gained post hammer springcompression may be inadequate to reach the desired high outlet speeds.Spring thickness may be increased to enhance spring energy. However, incase of increase of spring thickness, setting operation gets difficultbecause of inadequate distance required for compression of spring inmechanism where spring runs.

A second problem is the instability of muzzle velocity. After certaintime of use of rifle, because of fatigue of the spring used therein,muzzle velocity shows decrease in outlet speed and even rifle fails towork.

PURPOSE OF THE INVENTION

Purpose of the invention is to achieve desired high outlet speed bygaining required compression energy by use of gas piston instead ofhelical spring used as hammer spring and by help of lever arm.

Another purpose of the invention is to eliminate the problems that mightoccur because of fatigue of spring after use of rifle for a certainperiod of time.

Required compression energy gained by use of gas piston is not adequatefor achievement of desired outlet speed alone. When trigger is pressed,hammer is driven and hits the air outlet valve and firing is conductedby the air released from the tube but hit of hammer directly onto needleis not adequate for achievement desired high outlet speeds. A partfunctioning as lever is placed before air outlet valve needle for this.Thus hammer hits this part and increase force transmitted to needle andthus required outlet speed is achieved.

DETAILED DESCRIPTION OF THE INVENTION

Gas piston and lever arm developed in order to achieve the purpose ofthe invention are shown in the figures.

The figures are as follows:

FIG. 1: General view of parts forming firing system of PCP rifle

FIG. 2: Detailed view of parts forming firing system of PCP rifle

FIG. 3: Detailed view of air outlet valve needle

FIG. 4: Detailed view of air outlet valve body

FIG. 5: Detailed view of lever

FIG. 6: Detailed view of hammer

FIG. 7: Detailed view of setting arm

FIG. 8: Detailed view of mechanism body

FIG. 9: Detailed view of gas piston

FIG. 10: Detailed view of lever fixing pin

Parts are designated numbers in the pictures in order to make betterunderstanding of parts functioning as gas piston and lever in theinvention. Accordingly;

-   -   1—Air outlet valve needle    -   2—Air outlet valve body    -   3—Lever    -   4—Hammer    -   5—Set lever    -   6—Mechanism body    -   7—Gas piston    -   8—Fixing pin    -   9—Preventive surface    -   10—Body centring    -   11—Lever hitting surface    -   12—Needle housing    -   13—Valve body centring surface    -   14—Needle contact surface    -   15—Centring hole    -   16—Pushing surface    -   17—Kicking surface    -   18—Hitting surface    -   19—Hammed centring surface    -   20—Hammer rest surface    -   21—Lever fixing hole    -   22—Gas piston fixing chamber    -   23—Hammer housing    -   24—Valve body fixing body    -   25—Mechanism body fixing chamber    -   26—Gas piston rest surface    -   27—Fixing pin surface

A general view of pre-charged pneumatic (PCP) rifle comprising gaspiston (7), hammer (4) and lever (3) disclosed under the invention isshown in FIG. 1. FIG. 2 shows detailed view of gas piston (7), hammer(4) and lever (3) of the invention.

After the set lever (5) shown in FIG. 7 is pulled back, hammer (4)connected to said set lever (5) contacts gas piston (7) at hammer restsurface (20) and pushes gas piston (7) spindle inside and air insidesaid gas piston (7) is compressed. When trigger is pressed compressedair in gas piston (7) moves forward said gas piston (7) spindle (FIG.9). Gas piston rest surface (26) which is end part of gas piston (7)spindle pushes the hammer (4) from back by means of rest surface (20) ofhammer. Centring surface (19) of hammer moves linearly in hammer housing(23) located on mechanism body (6) and hammer (4) firstly hits pushingsurface (16) with hit surface (18) in the lower part of the lever (3)(FIG. 5).

Gas piston fixing chamber (22) and mechanism body fixing chamber (25)sit onto each other and mechanism body (6) and gas piston (7) areconnected. Lever fixing hole (21) located on mechanism body (6) andcentring hole (15) located in end part of upper section of the lever (3)are overlapped by help of fixing pin (8) shown in FIG. 10 andinterconnected by means of fixing pin (8). Lever fixing hole (21) andcentring hole (15) conduct rotating action on fixing pin surface (27).By effect of this action, lever (3) is fixed to valve body connectionchamber (24) located on mechanism body (6) shown in FIG. 8 by air outletvalve body (2) centring surface (13) (FIG. 4). Air outlet valve needle(1) in needle housing (12) which is centred section in air outlet valvebody (2) moves in direction of body centring (10). With this pushingmotion, needle contact surface (14) on the lever (3) pushes the leverhit surface (11) shown in FIG. 3 and provides removal of air outletvalve needle (1) from surface (9) preventing air passing in air outletvalve body (2) and thus release of air from tube.

Hammer (4) pushing the lever (3) continues pushing movement until thelever (3) contacts the kicking surface (17) which is upper surface. Hitsurface (18) presses kicking surface (17) and force of air outlet valveneedle (1) is adequate to push back the hammer (4). If the hit surface(18) shown in FIG. 6 presses only push surface (16), force of air outletvalve needle (1) will not be adequate to push the hammer (4) back andtherefore air in tube is released at once. In such case system does notallow a second shooting and air re-loading is required.

1. A firing system in pre-charged pneumatic (PCP) rifle characterizedcomprising at least one gas piston (7), at least one hammer (4) and atleast one lever (3) with one angled edge in order to achieve high outletspeeds during shooting.
 2. Lever (3) according to claim 1 characterizededge of said lever (3) close to hammer (4) is of angled and curvedembodiment.
 3. Lever (3) according to claim 1 characterized pushingsurface (16) located in lower part of said lever (3) is located in aposition closer to the hammer (4) in comparison to kicking surface (17)located in upper area of lever (3).
 4. Lever (3) according to claim 1characterized the hammer (4) presses pushing surface (16) before pushingkicking surface (17).
 5. Lever (3) according to claim 1 characterizedcomprising at least one centring hole (15) providing fixing to mechanismbody (6) by fixing pin (8).
 6. Hammer (4) according to claim 1characterized comprising hit surface (18) pushing the lever (3) linearlyand contacting said lever (3) to pushing surface (16).